Francesco may have lived to see this realisation of his hopes, for he seems to have died about 1388, leaving the Marquisate to his elder son, Giacomo, under the regency of his widow Euphrosyne, a daughter of the famous insular family of Sommaripa, which still survives in the Cyclades[359]. But the young Marquess soon found that he had only exchanged his tribute to the Catalan Vicar-General for a tribute to the Sultan. We are not told the exact moment at which Bayezid I imposed this payment, but there can be little doubt that Boudonitza first became tributary to the Turks in the campaign of 1393-4, when “the Thunderbolt” fell upon Northern Greece, when the Marquess’s Serbian brother-in-law was driven from Pharsala and Domoko, when Lamia and Neopatras were surrendered, when the county of Salona, founded at the same time as Boudonitza, ceased to exist. On the way to Salona, the Sultan’s army must have passed within four hours of Boudonitza, and we surmise that it was spared, either because the season was so late—Salona fell in February, 1394—or because the castle was so strong, or because its lord was a Venetian. This respite was prolonged by the fall of Bayezid at Angora and the fratricidal struggle between his sons, while the Marquess was careful to have himself included in the treaties of 1403, 1408, and 1409 between the Sultan Suleyman and Venice; a special clause in the first of these instruments released him from all obligations except that which he had incurred towards the Sultan’s father Bayezid[360]. Still, even in Suleyman’s time, such was his sense of insecurity, that he obtained leave from Venice to send his peasants and cattle over to the strong castle of Karystos in Eubœa, of which his brother Nicolò had become the lessee[361]. He figured, too, in the treaty of 1405, which the Republic concluded with Antonio I Acciajuoli, the new ruler of Athens, and might thus consider himself as safe from attack on the south[362]. Indeed, he was anxious to enlarge his responsibilities, for he was one of those who bid for the two Venetian islands of Tenos and Mykonos, when they were put up to auction in the following year. In this offer, however, he failed[363].